Question

An organic compound contains $C,H$ and $S$. The minimum molecular weight of the compound containing $8\%$ sulphur is:

[atomic weight of $S=32amu$]

• A. $200g$ $mo{l}^{-1}$
• B. $400g$ $mo{l}^{-1}$
• C. $300g$ $mo{l}^{-1}$
• D. $600g$ $mo{l}^{-1}$

Answer 1

The correct option is B $400g$ $mo{l}^{-1}$

$8\%$ S means 100 g of compound contains 8 g of S.

The atomic mass of S is 32 amu.

The minimum molecular weight of the organic compound will be

$\frac{100\times 32}{8}=400g/mol$

Hence, the correct option is $B$.